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Why are my twins blood group different to mine. My twins are Blood group A neg I am O rh pos How could this happen Also what are the origins of my sons blood?
Wiki User
∙ 14y ago
The other parent must have type A or type AB blood. That combined with yours to give genotype AO, which gives your twins type A blood because O is recessive. Blood is made in the bone marrow.
(someone else will have to help about rhesus factors, I don't know enough about them)
Wiki User
∙ 14y ago
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